Inside the Open-Source OT Toolbox: What Building Teams Are Testing, Using, and Debating Right Now

This NexusCon 2025 presentation brought together a group of deeply technical practitioners to showcase and pressure-test open-source tools shaping the future of OT in buildings. Moderated by April Yi (Director of Digital Engineering, Microsoft), the lineup included Trevor Pering (Google), Doug Plumley (Dartmouth College), Roger Quesnel (SkyFoundry), Mike Robbins (Lockheed Martin), and Stephen Dawson-Haggerty (Normal). Rather than polished case studies, each speaker walked through a specific tool, pattern, or workflow they’re actively experimenting with—from open device interfaces and semantic tagging to LoRaWAN sensing and simulated control sequences. The goal wasn’t consensus, but hands-on learning and honest debate with peers who are dealing with the same integration headaches.

Behind the paywall, you’ll see how these tools behave when they collide with real constraints: legacy BAS, inconsistent data, limited staff time, and procurement friction. The speakers share what they’re trying to replace—manual point mapping, re-typing sequences, brittle integrations—and where open source is helping or still falling short. You’ll hear candid takes on where standards help, where flexibility causes pain, and what it actually takes to onboard devices and data without rebuilding everything from scratch. If you’re an FM, EM, or OT leader trying to separate open-source promise from operational reality, this recording gives you direct exposure to the tools—and the thinking—driving the conversation forward.

Watch the full recording inside Nexus Pro →

Dartmouth:

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Google:

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Lockheed: 

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Normal: 

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SkyFoundry: 

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Breakouts: